I don't have direct experience with it, so I can only share anecdotal information. I've read in past discussions here, that even f/t or pre-killed - hamsters have longer teeth that can often cause internal damage while being ingested. The folks that reported it said that they had witnessed the damage first hand.
Again - I don't have direct experience with it, but you asked if there was any health issue, and this was what I remember from a similar discussion.
I would imagine though, that dwarf hamsters wouldn't be much more than a bite sized snack for an adult ball python. Do you have a back-up plan?
Where are you located?